Depends which kind of demister you have. If it is painted one on the inner surface of the window you might be able to repair broken traces with silver paint. If it is built in barely visible lines inside the glass then only option is new glass. I have the one with built in heater inside of glass so out of luck. It is only about 1/3rd working from the middle up on mine.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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